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In Reply to: RE: Making your own audio cables cheap. posted by Michael Samra on June 30, 2016 at 00:49:40
This is actual coaxial wire in the sense you have two conductors and a shield.The shield actually acts as an antenna to collect noise or RF and and take it to ground.This is why I only hook the shield to one end of the cable's negative wire.In other words,one of you RCAs will have 3 wires connected at one end,and the shield being that 3rd wire in this case..This is also why you see direction arrows on some cables I would guess because you want the shielded grounded end going into the preamp and then from the preamp to amp for another set of cables.If you ground the shield at each end of the cable,it won't be effective as a shield for noise.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Edits: 06/30/16Follow Ups:
Not wanting to get into silly wire stuff, but a "Ground" means a ground, the thing is either grounded or it is not. Where you attach a shield to the ground only makes a difference if you have a high resistance in your ground return. I would solve that problem first.Wire "directionality" is some silly tripe about the wire being conditioned to the AC signal flowing in one direction, which is quite insane (which is why this is an Asylum). :-)
Edits: 07/03/16
Where you attach a shield to the ground only makes a difference if you have a high resistance in your ground return. I would solve that problem first.
The point is you only want to attach the shield on one end,not both.If you look at the old tuners,they also leave shield open at the input signal end and attach it to the chassis at the opposite end.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
There is a lot to grounding. Shields are typically attached to both ends of a patch cord. Inside a piece of equipment there is no need to ground both ends of a shielded wire as you typically don't use the shield or an associated secondary wire as a ground path. I never ground both ends of a shield inside a chassis to avoid ground loops. For an patch cord, you use both positive (signal) and negative (ground) wires in order to complete a ground circuit between components. Since the shield is in parallel to the ground wire, grounding both ends does not produce a loop.
With the right equipment you can test your noise theory and measure the noise picked up by a patch cord depending on which end you are using and which end you have the shield grounded to. The only voltage (noise) differences that will be developed will be due to differences in the resistance to ground. Remember that each component case is in effect a giant shielded wire, star grounds help prevent loops. Avoiding a ground loop is likely why you see one end of the shield not connected in your tuner.
Shields are typically attached to both ends of a patch cord
If I had a single conductor and was using the shield as the second conductor,I would then hook up both ends of the shielded wire.If I have two conductors and the a shield,I only hook up one end because of ground loops.I do it added insurance because you then get the true effect of the shield..I guess there school of thoughts on both ways,depending on whom you talk to.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
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